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Community Member

Supporting legacy clients

I have a 1250 series AP running the 2.4 module. I am using WPA-PSK and everything works fine when using a newer laptop or any wireless device. The problem is that I cannot seem to get older clients (A and B) to even see the SSID. It might be that it's 2.4? it might be the encryption? It might be that I'm just missing something very obvious.

Here is my config:


Current configuration : 3378 bytes
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname WestAP2
!
enable secret 5 $1$8T5E$e3GIoiQBtrN3DsSM8YIfT.
!
no aaa new-model
ip domain name guestdmz.com
!
!
!
dot11 ssid CorpLink
   authentication open
   authentication key-management wpa
   wpa-psk ascii 7 0458040B023442471D00
   information-element ssidl advertisement wps
!
power inline negotiation prestandard source
!
crypto pki trustpoint TP-self-signed-1965865322
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-1965865322
revocation-check none
rsakeypair TP-self-signed-1965865322
!
!
crypto pki certificate chain TP-self-signed-1965865322
certificate self-signed 01
  3082024C 308201B5 A0030201 02020101 300D0609 2A864886 F70D0101 04050030
  31312F30 2D060355 04031326 494F532D 53656C66 2D536967 6E65642D 43657274
  69666963 6174652D 31393635 38363533 3232301E 170D3032 30333031 32313433
  33375A17 0D323030 31303130 30303030 305A3031 312F302D 06035504 03132649
  4F532D53 656C662D 5369676E 65642D43 65727469 66696361 74652D31 39363538
  36353332 3230819F 300D0609 2A864886 F70D0101 01050003 818D0030 81890281
  8100DB91 5B0C3440 61DC289C 28A5852B 79EDAF89 7B8C6D29 9E70334D D1215728
  215A99CD 63DEC33B 15CA6DE2 E428DFAA 77E530EB F43F1DAF A8B3592B 7FE7830A
  7968B346 8EC3F129 E0824D86 0564E0DB 431C90B9 771F0988 31ECD657 8AF83381
  987DB63B 91855AAF FE4C464A 1B9F1FD1 3B4C0D03 FDFCD4EE 93525B46 224EFB69
  AE6F0203 010001A3 74307230 0F060355 1D130101 FF040530 030101FF 301F0603
   551D1104 18301682 14576573 74415032 2E677565 7374646D 7A2E636F 6D301F06
  03551D23 04183016 8014E280 7B95AC69 B4E4B6E5 84F160E7 D62894DA F297301D
  0603551D 0E041604 14E2807B 95AC69B4 E4B6E584 F160E7D6 2894DAF2 97300D06
  092A8648 86F70D01 01040500 03818100 827E1A85 2E4B36EE D8D359CB CD219B7C
  3C9468A4 68D45E24 6902524F A564FC8F 77D05803 4B91239F 35D7D238 1466970B
  520D4365 C7E19E0A 1DD080FE 2DA07148 28B00A9B F32BF0E4 CA3EAEFD C162FF42
  96130348 4C85BF05 1CA2CF43 623A7ED4 C50253BA 7F707C0C 0C24568B 8A506D86
  40DBF32F DDDC96FC A44B343B 0A64AFAD
  quit
username Cartman privilege 15 secret 5 $1$gaLV$7BqZtuHu6Mg9j8xHNTOFB/
!
bridge irb
!
!
interface Dot11Radio0
no ip address
no ip route-cache
!
encryption mode ciphers tkip
!
ssid CorpLink
!
speed  basic-1.0 basic-2.0 basic-5.5 basic-11.0 basic-6.0 basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0 basic-48.0 basic-54.0 m0. m1. m2. m3. m4. m5. m6. m7. m8. m9. m10. m11. m12. m13. m14. m15.
  channel width 40-below
station-role root
bridge-group 1
bridge-group 1 subscriber-loop-control
bridge-group 1 block-unknown-source
no bridge-group 1 source-learning
no bridge-group 1 unicast-flooding
bridge-group 1 spanning-disabled
!
interface GigabitEthernet0
no ip address
no ip route-cache
duplex auto
speed auto
bridge-group 1
no bridge-group 1 source-learning
bridge-group 1 spanning-disabled
!
interface BVI1
ip address 192.168.124.201 255.255.255.0
no ip route-cache
!
ip default-gateway 192.168.124.1
no ip http server
ip http secure-server
ip http help-path
http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag
access-list 111 permit tcp any any neq telnet
snmp-server community fcb RO
bridge 1 route ip
!
!
!
line con 0
access-class 111 in
line vty 0 4
access-class 111 in
login local
!
end

Thanks,

Dave

1 REPLY
Hall of Fame Super Red

Re: Supporting legacy clients

Hi Dave,

I'm pretty sure this issue has to do with your Date rates;

Configuring Radio Data Rates

You use the data rate settings to choose the data rates the wireless device uses for data transmission. The rates are expressed in megabits per second. The wireless device always attempts to transmit at the highest data rate set to Basic, also called Require on the browser-based interface. If there are obstacles or interference, the wireless device steps down to the highest rate that allows data transmission. You can set each data rate to one of three states:

Basic (the GUI labels Basic rates as Required)—Allows transmission at this rate for all packets, both unicast and multicast. At least one of the wireless device's data rates must be set to Basic.

Enabled—The wireless device transmits only unicast packets at this rate; multicast packets are sent at one of the data rates set to Basic.

Disabled—The wireless device does not transmit data at this rate.


Note At least one data rate must be set to basic.


You can use the Data Rate settings to set an access point to serve client devices operating at specific data rates. For example, to set the 2.4-GHz radio for 11 megabits per second (Mbps) service only, set the 11-Mbps rate to Basic and set the other data rates to Disabled. To set the wireless device to serve only client devices operating at 1 and 2 Mbps, set 1 and 2 to Basic and set the rest of the data rates to Disabled. To set the 2.4-GHz, 802.11g radio to serve only 802.11g client devices, set any Orthogonal Frequency Division Multiplexing (OFDM) data rate (6, 9, 12, 18, 24, 36, 48, 54) to Basic. To set the 5-GHz radio for 54 Mbps service only, set the 54-Mbps rate to Basic and set the other data rates to Disabled.

You can configure the wireless device to set the data rates automatically to optimize either the range or the throughput. When you enter range for the data rate setting, the wireless device sets the 1 Mbps rate to basic and the other rates to enabled. The range setting allows the access point to extend the coverage area by compromising on the data rate. Therefore, if you have a client that is not able to connect to the access point while other clients can, one reason may be because the client is not within the coverage area of the access point. In such a case using the range option will help in extending the coverage area and the client may be able to connect to the access point. Typically the trade-off is between throughput and range. When the signal degrades (possibly due to distance from the access point,) the rates will renegotiate down in order to maintain the link (but at a lower data rate). Contrast that against a link configured for a higher throughput that will simply drop when the signal degrades enough to no longer sustain a configured high data rate, or roam to another access point with sufficient coverage, if one is available. The balance between the two (throughput vs. range) is one of those design decisions that has to be made based on resources available to the wireless project, type of traffic the users will be passing, service level desired, and as always, the quality of the RF environment.When you enter throughput for the data rate setting, the wireless device sets all four data rates to basic.


Note When a wireless network has a mixed environment of 802.11b clients and 802.11g clients, make sure that data rates 1, 2, 5.5, and 11 Mbps are set to required (basic) and that all other data rates are set to enable. The 802.11b adapters do not recognize the 54 Mbps data rate and do not operate if data rates higher than 11Mbps are set to require on the connecting access point.

http://www.ciscosystems.com/en/US/docs/wireless/access_point/12.4_10b_JA/configuration/guide/scg12410b-chap6-radio.html#wp1101903

Cheers!

Rob

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